Mountainman - he asked how they planned to keep the aircraft deiced during the winter so that they could achieve their 10 minute readiness state - the reply was that it was an engineering issue but gave no indication as to how it would be addressed.
He also asked how the aircraft would be kept pointing into wind in an area that could go from 40 kts in one direction to 50 kts in another in a very short period - the answer was the same but hinted that an engineer would be sent out with an electric handler/dolly in the 50 kt wind to move it. I don't know how many engineers will be on the rig to support the helicopter but I will be surprised if it is more than 2.
As for the HSE requirements, 21 wet survivors from a dark and stormy sea in 30 minutes? Not without a very well trained, practised and fit winchman and even then he'd be f**ked at the end of it and certainly in no shape to give medical assistance. Even doing them as double lifts from the comparative safety of a large dinghy would take 30 minutes.